人工监测水位,应测量两次,间隔时间不应少于(),取两次水位的平均值,两次测量允许偏差
题型:单项选择题
问题:
人工监测水位,应测量两次,间隔时间不应少于(),取两次水位的平均值,两次测量允许偏差为±0.02m。
A、1min
B、10min
C、30min
D、1h
人工监测水位,应测量两次,间隔时间不应少于(),取两次水位的平均值,两次测量允许偏差为±0.02m。
A、1min
B、10min
C、30min
D、1h
A. built
B. was built
C. has built
D. has been built
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